NULL is overwritable (scalars are not)

null-is-overwritable.php

<?php
// Conclusion: NULL is in this case considered to be of no value, and PHP
// thinks that it is OK to overwrite, but integers are not treated the same


// This code will assign NULL and the ignore that NULL was assigned and create a stdClass:
$a = NULL;
$a->test = "apa";  // should warn in my oppinion
print_r($a);


// Will output:
 
// stdClass Object
// (
//     [test] => apa
// )


// Whether this code will warn instead of overwriting the integer:

$a = 54;
$a->test = "apa";
print_r($a);


// Will output:

// PHP Warning:  Attempt to assign property of non-object in Command line code on line 1
// 54